Efficient Access to Chiral Benzhydrols via Asymmetric Transfer Hydrogenation of Unsymmetrical Benzophenones with Bifunctional Oxo-Tethered Ruthenium Catalysts
作者:Taichiro Touge、Hideki Nara、Mitsuhiko Fujiwhara、Yoshihito Kayaki、Takao Ikariya
DOI:10.1021/jacs.6b05738
日期:2016.8.17
A concise asymmetric transfer hydrogenation of diaryl ketones, promoted by bifunctional Ru complexes with an etherial linkage between 1,2-diphenylethylenediamine (DPEN) and η(6)-arene ligands, was successfully developed. Because of the effective discrimination of substituents at the ortho position on the aryl group, unsymmetrical benzophenones were smoothly reduced in a 5:2 mixture of formic acid and
成功地开发了二芳基酮的简洁不对称转移氢化,由双功能 Ru 配合物促进,在 1,2-二苯基乙二胺 (DPEN) 和 η(6)-芳烃配体之间具有醚键。由于芳基邻位取代基的有效区分,不对称二苯甲酮在甲酸和三乙胺的 5:2 混合物中被平滑还原,具有前所未有的优异对映选择性。对于非邻位取代的二苯甲酮,氧系催化剂电子识别偏向底物,产生有吸引力的性能,产生具有 >99% ee 的手性二芳基甲醇。